Tumor Detection In Brain Using Morphological Image Processing

Journal of Applied Science and Engineering Methodologies,Volume.1,No.1, 2015, Page.131-136
Tumor Detection In Brain Using Morphological Image Processing
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U.Vanitha , P.Prabhu Deepak , N.Pon Nageswaran , R.Sathappan
III-year, department of electronics and communication engineering
SVS College of engineering, Coimbatore.India
Email: [email protected] +91 9489533154
[email protected] +91 8344214170
Abstract: -
In developing countries like India the causes of disease like cancer will degrade the economy of the
country. Image processing is the field to detect these kind of unwanted cells and reviles the amount it
spreads. In this paper the detection of tumor in brain, either malignant tumor or non- malignant
tumor is done. The morphological image processing is to be used in order to locate and identify the
size of tumor. The image from MRI scan will tell the presence of tumor in the brain, but we have to
find the size of that tumor. The recent technology came for finding the size, shape, type and other
important specification regarding the tumor like CT scan. This paper will show how the image from
MRI scan is adjusted to suitable contrast and tumor is separated from the original image.
Keywords: - malignant, tumor, MRI scan, CT scan, morphological image processing, separate
Introduction:
Image processing is the field were the information from images can be retrieved
using suitable algorithm. In this paper the morphological image processing is used to detect
the tumors from the brain either malignant or non-malignant tumors. The brain tumors some
times change to malignant will leads to cancer. There are several techniques to capture image
of brain like MRI, CT scan etc… A tumor is a mass of tissue that grows out of control of the
normal forces that regulates growth. The multifaceted brain tumors can be split into two
common categories depending on the tumors beginning, their enlargement prototype and
malignancy. Primary brain tumors are tumors that take place commencing cells in the brain or
commencing the wrapper of the brain. In this paper, the morphological operations like
dilation, erosion etc… was done to remove the tumor from the MRI Image. Recent techniques
achieved in researches for detection of brain tumor can be broadly classified as
1. Histogram based method.
2. Morphological operation is applied to MRI images of Brain.
3. Edge base segmentation and color base segmentation.
4. Cohesion self-merging based partition K-mean
Algorithm. We are going to use only the morphological operation.
Magnetic Resonance Imaging (MRI):
MRI is basically used in the medical field to detect, estimate the effects of
disease and analyse the internal structure of the body. This technique is basically used to
detect the differences in the tissues which have a far better technique as compared to
computed tomography. So this makes this technique a very special one for the brain tumor
detection and cancer imaging.
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Journal of Applied Science and Engineering Methodologies,Volume.1,No.1, 2015, Page.131-136
Work flow:
The flow chart Fig (1) below will express the operation.
From the flow chart the image is read, converted to intense, resized, contrast adjusted, eroded
and threshold to separate the tumor from the MRI image using MATLAB tool. One of the
journal papers Doi:01.0401/ijaict.2014.03.08 Published Online 05 (08) 2014 uses the
watershed algorithm and edge detection algorithm to Get the tumor out. But in this paper the
watershed algorithm is neglected, and the erosion (morphological algorithm) is used to
separate the tumor. The size of the image can be detected. If the tumor is fully spherical then
we can find the volume of that tumor approximately.
Proposed work:
I)
Preprocessing:
The pre-processing involves the resizing, image conversion, image
contrast adjustments etc… the image from the MRI cannot be directly used for this operation
so some process has to be done to ensure the operation. The first thing has to be done is to
resize the image to standard size. Here the images are resized to the standard size of 120*120.
Then the image in the form of RGB color standards is converted to intense image. Then the
contrast of the image is adjusted to particular extend. This is because the obtain image from
source may contain the noise so these noises has to be removed to improve the quality of
output. Thus the preprocessing was done. The Fig (2.a) shows the preprocessed output and
Fig (2.b) represents the workspace showing the specification of the outputs.
II) Post processing:
This process involves the erosion and threshold
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Journal of Applied Science and Engineering Methodologies,Volume.1,No.1, 2015, Page.131-136
Erosion:
Erosion of the image by flat structure b at any location (i, j) is defined as the minimum
value of the image in the region coincident with b when the origin of b
is at (i, j). Let f be the image and (i, j) be the coordinates then erosion
be states as
{f (i+s, j+t)}
where b is the structural element. The Neighbourhood or structuring element parameter is
used to define the neighbourhood or structuring element that the block applies to the image.
A neighbourhood is specified by entering a matrix or vector of ones and zeros. The strel
function is used to specify a structuring element. Here the disk shaped structural element was
created by using the keyword ‘disk’. Radius is set to be 20 for this operation. Based on the
specification and input image obtain, the radius and structural element is to be changed. Refer
Fig (3.a) left image for erosion output.
f (−)b](i, j) = min(s, t) ƹb
[
Threshold operation:
In this process the eroded image was converted from an intensity image to a
binary image. This process uses Otsu's method, which determines the threshold by splitting
the histogram of the input image such that the variance for each of the pixel groups is
minimized. The thresholded image (binary image) was defined as
a if f(x,y) > T
g(x,y)
b if f(x,y)>=T
Where a=1(white)
b=0(black)
This operation uses the second portion that b if f(x, y)>=T. let T is to be found from the
histogram of input pre-processed image. After this step the output is noted to be the tumor.
Thus the tumor is separated from the MRI image. The Fig (3.a) right image shows threshold
image. The Fig (3.b) shows the workspace of post processing
Fig (3.b)
Fig (3.a)
Object
Brain
Image size
<576x456 uint8>
Pixels
262656
Tumor
<93x108 uint8>
5669
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Journal of Applied Science and Engineering Methodologies,Volume.1,No.1, 2015, Page.131-136
Finding size:
The size of the detected tumors can be found using the specifications in the
workspace. Here imtool is used to find the size of the tumor(93*108).
Results:
From the above experiments proved that the tumor is detected and size is found
using morphological image processing techniques. The images below shows the processing
steps.
ORIGINAL IMAGE
AFTER RESIZE
INTENSE IMAGE
AFTER CONTRAST ADJUSTMENT
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Journal of Applied Science and Engineering Methodologies,Volume.1,No.1, 2015, Page.131-136
AFTER EROSION
AFTER THRESHOLD
HISTOGRAM OF ALL OUTPUTS
PLOTS OF ALL OUTPUT
CONCLUSION:
Thus from the histogram output the improvement of the outputs step by
step is shown. The final output shows that the tumor would be in the region of 250 to 300.
The plot also shows the presence of tumor between the regions 250 to 300.
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Journal of Applied Science and Engineering Methodologies,Volume.1,No.1, 2015, Page.131-136
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About Authors:
U.Vannitha was currently working as assistant professor in Electronics and
communication engineering, at SVS College of engineering.
[email protected]
P.Prabhu
Deepak was doing U.G in Electronics and
Communication Engineering pre-final year at SVS College of
Engineering, Coimbatore. [email protected]
R.Sathappan was doing U.G in Electronics and Communication
Engineering pre-final year at SVS College of Engineering,
Coimbatore.
N.Pon
Nageswaran was doing U.G in Electronics and
Communication Engineering pre-final year at SVS College of
Engineering, Coimbatore.
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